package com.situ.blog.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@WebFilter(filterName = "encoding",urlPatterns = "/*")
public class EncodingFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        //System.out.println("EncodingFilter.init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("EncodingFilter.doFilter");
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        //这里的method是form表单中method请求post还是get
        String method = request.getMethod();
        if ("post".equalsIgnoreCase(method)){
            request.setCharacterEncoding("UTF-8");
        }
        filterChain.doFilter(servletRequest,servletResponse);

    }

    @Override
    public void destroy() {
        //Filter.super.destroy();
    }
}
